cc: Recreate small layer tiles when size changes

cc/picture_layer_tiling.cc

Index: cc/picture_layer_tiling.cc
diff --git a/cc/picture_layer_tiling.cc b/cc/picture_layer_tiling.cc
index ae3afc39d0451f79f96449138fba168f8f90ae2a..0a339a38b1435f72d12d66912fb5aa9a78b355c0 100644
--- a/cc/picture_layer_tiling.cc
+++ b/cc/picture_layer_tiling.cc
@@ -92,6 +92,8 @@ void PictureLayerTiling::SetLayerBounds(gfx::Size layer_bounds) {
   if (tile_size != tiling_data_.max_texture_size()) {
     tiling_data_.SetMaxTextureSize(tile_size);
     tiles_.clear();
+    CreateTilesFromLayerRect(gfx::Rect(layer_bounds_));

[danakj, 2013/02/12 01:31:20]

What if you set old_layer_bounds to empty here? Would that allow better reuse of
the code below instead of early out?

[enne (OOO), 2013/02/12 01:34:39]

Hmm.  I'm not sure the single line of reuse makes it worth the extra
complication.

[danakj, 2013/02/12 01:36:24]

For instance, if you did it that way, you'd also get an Invalidate over the
whole layer. Why do you want to skip that here?

[danakj, 2013/02/12 01:37:56]

(Especially considering Justin's desire to record somehow based on the tile
size).

+    return;
   }
 
   // Any tiles outside our new bounds are invalid and should be dropped.